in the New York City's extensive commuter rail system. Arrests On 21 July 2006, police arrested three people suspected to be involved in the bombings. Police have detained more than 300 suspects since 18 July but these are the first arrests in the case. Two of the men were detained on Thursday in the northern state of Bihar and the third later in Mumbai. All three are said to belong to the banned SIMI organisation. On the same day, Abdul Karim Tunda was thought to be arrested in Mombasa, Kenya on suspicions of involvement in the train bombings. but it was the wrong person. He was one of India's most wanted men and also a suspected organiser for the banned terrorist group Lashkar-e-Taiba. He was arrested in 2013 near the Nepal border. In late 2006, all the seven key accused in the Mumbai train blasts in July retracted their alleged confession to the police, saying they were illegally forced to sign blank papers, an Indian TV channel reported. Continuing investigation M K Narayanan, the Indian National Security Advisor, has said that India doesn't have "clinching" evidence of the involvement of ISI in the Mumbai train blasts of 11 July. "I would hesitate to say we have clinching evidence but we have pretty good evidence," he was quoted as saying on CNN-IBN. Following Narayanan's remarks, the Union Home Secretary V.K. Duggal on Monday characterised the evidence as "very good [...] it is fairly solid evidence,". 5 On 25 September 2008, Hindustan Times reported that "the Crime branch also learnt that the men [behind 2008 Delhi bombings] are those very operatives who had introduced themselves as Pakistanis to perpetrators of 11 July 2006 Mumbai train bombings. Involvement of Indian Mujahideen On 27 February 2009, Sadiq Sheikh, an arrested leader of the Indian Mujahideen confessed to his alleged role in the bombings in a news channel broadcast. He claimed to have engineered the pressure cooker bombs with his associates in a flat in central Mumbai. If verified, these allegations could invalidate the previous claims by the ATS that the ISI or the SIMI were involved. Sadiq states in his confession, ‘'All five of us arranged local first class train passes beforehand. We also had the local train time table with us so that we could choose a train as per our convenience. We purchased bags and pressure cookers in Bombay.'’ He also claimed